High Performance Computing on Vector Systems 2008 by Sabine Roller, Katharina Benkert, Martin Galle, Wolfgang

By Sabine Roller, Katharina Benkert, Martin Galle, Wolfgang Bez, Hiroaki Kobayashi, Toshio Hirayama

This e-book offers the cutting-edge in high-performance computing and simulation on smooth supercomputer architectures. It covers tendencies in and software program improvement usually and in particular the way forward for vector-based structures and heterogeneous architectures. the appliance contributions hide computational fluid dynamics, fluid-structure interplay, physics, chemistry, astrophysics, and weather learn. cutting edge fields like coupled multi-physics or multi-scale simulations are provided. All papers have been selected from displays given on the 7th Teraflop Workshop, held in November 2007 at Tohoku collage, Japan; the 8th Teraflop Workshop, held in April 2008 on the Höchstleistungsrechenzentrum Stuttgart (HLRS), Germany; and on the Japan Atomic power enterprise in April 2008.

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MpCCI acts as server and the API of the simulation code is the client. A pair of server and client for every simulation code has to be started. The internal communication between the servers uses MPI. Information exchange between the server and client is done by remote shell command like RSH/SSH. MpCCI does not interfere with internal parallelization of the simulation code based on MPI [6]. Fig. 8 MpCCI communication This method was used to couple two applications, FENFLOSS (Flow simulation) running on the SX-8 and Abaqus (structure analysis) running on the PC cluster [12].

By the SPNEGO mechanism negotiation (IETF/RFC4559), the combination of almost all client OSs and web browsers, which are in circulation at present, realizes SSO to each server in our HPC system. The NAREGI middleware β 2 cannot use the Kerberos authentication system we have introduced. Therefore, two authentication systems will exist independently in our HPC system if we construct a portal of the grid computing by just using the NAREGI middleware β 2. This forces a user to manage multiple IDs and passwords for both authentication systems.

For the simulation of the spray jet, the flow conditions described by the Navier-Stokes equations with conservation of energy, mass and momentum as well as parts of Maxwell’s equations for the description of electrical field and charge transport have to be solved. The spraying of individual paint droplets is subsequently calculated using the differential equations of motion with a Lagrange particle tracking method taking into consideration special turbulence models and simultaneously solving the space and time-dependent differential equation for the electrical charging [3, 8] of each individual paint droplet (levels 1 and 2).

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